/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.aop;

import java.io.Serializable;
import java.lang.reflect.Method;

/**
 * Canonical MethodMatcher instance that matches all methods.
 *
 * @author Rod Johnson
 */
@SuppressWarnings("serial")
final class TrueMethodMatcher implements MethodMatcher, Serializable
{

    public static final TrueMethodMatcher INSTANCE = new TrueMethodMatcher();


    /**
     * Enforce Singleton pattern.
     */
    private TrueMethodMatcher()
    {
    }


    @Override
    public boolean isRuntime()
    {
        return false;
    }

    @Override
    public boolean matches(Method method, Class<?> targetClass)
    {
        return true;
    }

    @Override
    public boolean matches(Method method, Class<?> targetClass, Object... args)
    {
        // Should never be invoked as isRuntime returns false.
        throw new UnsupportedOperationException();
    }


    @Override
    public String toString()
    {
        return "MethodMatcher.TRUE";
    }

    /**
     * Required to support serialization. Replaces with canonical
     * instance on deserialization, protecting Singleton pattern.
     * Alternative to overriding {@code equals()}.
     */
    private Object readResolve()
    {
        return INSTANCE;
    }

}
